[xen staging] x86/pvh: declare PVH dom0 supported with caveats

[patchbot@xxxxxxx]

commit ea1cb444c28ce3ae7915d9c94c4344f4bf6d87d3
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Jun 10 13:29:25 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 10 13:29:25 2024 +0200

    x86/pvh: declare PVH dom0 supported with caveats
    
    PVH dom0 is functionally very similar to PVH domU except for the domain
    builder and the added set of hypercalls available to it.
    
    The main concern with declaring it "Supported" is the lack of some features
    when compared to classic PV dom0, hence switch it's status to supported with
    caveats.  List the known missing features, there might be more features 
missing
    or not working as expected apart from the ones listed.
    
    Note there's some (limited) PVH dom0 testing on both osstest and gitlab.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 CHANGELOG.md                  |  1 +
 SUPPORT.md                    | 15 ++++++++++++++-
 xen/arch/x86/hvm/dom0_build.c |  1 -
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 201478aa1c..1778419cae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
    - HVM PIRQs are disabled by default.
    - Reduce IOMMU setup time for hardware domain.
    - Allow HVM/PVH domains to map foreign pages.
+   - Declare PVH dom0 supported with caveats.
  - xl/libxl configures vkb=[] for HVM domains with priority over vkb_device.
  - Increase the maximum number of CPUs Xen can be built for from 4095 to
    16383.
diff --git a/SUPPORT.md b/SUPPORT.md
index d5d60c62ec..711aacf346 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -161,7 +161,20 @@ Requires hardware virtualisation support (Intel VMX / AMD 
SVM).
 Dom0 support requires an IOMMU (Intel VT-d / AMD IOMMU).
 
     Status, domU: Supported
-    Status, dom0: Experimental
+    Status, dom0: Supported, with caveats
+
+PVH dom0 hasn't received the same test coverage as PV dom0, so it can exhibit
+unexpected behavior or issues on some hardware.
+
+At least the following features are missing on a PVH dom0:
+
+  * PCI SR-IOV and Resizable BARs.
+
+  * Native NMI forwarding (nmi=dom0 command line option).
+
+  * MCE handling.
+
+  * PCI Passthrough to any kind of domUs.
 
 ### ARM
 
diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index 6acbaceb94..f3eddb6846 100644
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -1360,7 +1360,6 @@ int __init dom0_construct_pvh(struct domain *d, const 
module_t *image,
         print_e820_memory_map(d->arch.e820, d->arch.nr_e820);
     }
 
-    printk("WARNING: PVH is an experimental mode with limited 
functionality\n");
     return 0;
 }
 
--
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